Interfacial Chemical Bond–Enhanced Charge Polarization in CoTCPP/Bi12O17Br2‐Triggering Efficient CO2 Photoreduction

Abstract

Photocatalytic CO2 reduction is a prospective pathway to solve energy and environmental problems. Slow charge migration and insufficient active sites are pivotal obstacles to inhibit efficient photocatalytic CO2 reduction. Herein, cobalt–tetrakis(4‐carboxyphenyl)porphyrin (CoTCPP)/Bi12O17Br2 photocatalysts are successfully assembled by interfacial bridge Bi–O bonds between CoTCPP and Bi12O17Br2. The rearranged strong coupling interface in CoTCPP/Bi12O17Br2 enhances carrier polarization, allowing photoelectrons to directionally transfer and to aggregate at Co atoms. This polarization strategy facilitates rapid charge transportation and efficient CO2 activation, resulting in an improvement in CO2 photoreduction ability. After 5 h irradiation, the 0.2 wt% CoTCPP/Bi12O17Br2 exhibits a significantly enhanced photocatalytic CO2 reduction with a CO yield of 369.55 μmol g−1 (3.73 times that of Bi12O17Br2), achieving 100% product selectivity. In this work, an insight is provided for constructing efficient charge‐transfer structure through interfacial polarization strategy.